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Wireless Networking

SUBMITTED BY;

SURESH R

Preview

• What is Wireless Network?
• Brief History of Wireless networking
• Wireless Applications
• Types of Wireless network

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WPAN

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WLAN

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WMAN

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Mobile Device Networks

• Our Responsibility

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Choose the Right Technology

• Interoperability
• What is 802.11?

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802.11a vs. 802.11b

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802.11g

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Advantage

History of Wireless Networking

• Wireless Local Area Networks (WLAN) have been

around since 1970.

• The first model was created at the University of

Hawaii by Norman Abramson.

• This was a star topology and connected 7 computers

across 4 islands.

• Today, wireless networking is largely standardized

by IEEE and their various versions of 802.11.

Wireless Applications

Laptops

Cellular phones

Headphones

Keyboards

Printers

Speakers

Global Positioning

Systems (GPS)

Laser Bridges

Emergency Services

Robotics

Biotechnology

Nanotechnology

Radio Frequency

Identification (RFID)

transponders

The possibilities are

endless!

WMAN ’s are the connection of multiple WLAN’s

and may span an entire city or college campus.

i.e. WiMAX

Mobile device networks which are used by our

cell phones.

i.e. GSM (2G), 3G,4G cellular networks

Our Responsibility

We must

understand and

adequately

address the

inherent

security risks

involved with

wireless

networking.

Physical theft

1. Be aware of your

surroundings.

2. Secure your devices

when they are not in

use.

Wireless medium

Interoperability

• Before the IEEE 802.11 interoperability was based

on cooperation between vendors.

• IEEE 802.11 only standardizes the physical and

medium access control layers.

• Vendors must still work with each other to ensure

their IEEE 802.11 implementations interoperate

• Wireless Ethernet Compatibility Alliance

(WECA) introduces the Wi-Fi Certification to

ensure cross-vendor interoperability of 802.11b

solutions

What is 802.11?

• A family of wireless LAN (WLAN) specifications

developed by a working group at the Institute of

Electrical and Electronic Engineers (IEEE)

Defines standard for WLANs using the following

four technologies

Frequency Hopping Spread Spectrum (FHSS)

Direct Sequence Spread Spectrum (DSSS)

• Infrared (IR)
• Orthogonal Frequency Division Multiplexing

(OFDM)

Versions: 802.11a, 802.11b, 802.11g, 802.11e,

802.11f, 802.11i

802.11g

802.11g is a high-speed extension to 802.11b

Compatible with 802.11b

High speed up to 54 Mbps

2.4 GHz (vs. 802.11a, 5 GHz)

Using ODFM for backward compatibility

Adaptive Rate Shifting

802.11g Advantage

Provides higher speeds and higher capacity requirements

for applications

Wireless Public Access

Compatible with existing 802.11b standard

Leverages Worldwide spectrum availability

in 2.4 GHz

Likely to be less costly than 5 GHz alternatives

Provides easy migration for current users of 802.11b

WLANs

Delivers backward support for existing 802.11b products

Provides path to even higher speeds in the future